Question 2: Popularity of cloud databases has more than doubled in the past decade. Which cloud service model is driving this? 1 pointInfrastructure as a Service (IaaS) Platform as a Service (PaaS)Commercial databasesSoftware-as-a-Service (SaaS)

The cloud service model that is driving the popularity of cloud databases is Platform as a Service (PaaS).

Step by Step Explanation:

1. Infrastructure as a Service (IaaS): This model provides the infrastructure such as virtual machines and other resources like virtual-machine disk image library, block and file-based storage, firewalls, load balancers, IP addresses, virtual local area networks etc.

2. Platform as a Service (PaaS): This model is used for applications, and other development, while providing cloud components to software. What developers gain with a PaaS is a framework they can build upon to develop or customize applications. PaaS makes the development, testing, and deployment of applications quick, simple, and cost-effective.

3. Software-as-a-Service (SaaS): In this service model, the cloud-based applications are provided to the user, as a service on demand. It is a single instance of the service running on the cloud and multiple end users are serviced.

In the context of the question, PaaS is driving the popularity of cloud databases because it provides the platform and environment to build, test and deploy cloud databases. It eliminates the need for organizations to invest in the underlying infrastructure, thus making it cost-effective and efficient.